The radius of the circle below is 73 cm. Work out the circumference of the circle in meters. Give your answer to 1 d.p. Radius, r = 73 cm Circumference, C = 2 * pi * r C = 2 * pi * 73 cm C = 458.04 cm C = 4.58 m C ≈ 4.6 m

To calculate the circumference of a circle using the given radius, we can follow these steps:

Given Information:

The radius r of the circle is 73 cm.


Circumference Formula:

The formula to find the circumference C of a circle is: C = 2 × π × r where π ≈ 3.14159 .


Calculate Circumference in Centimeters:

Substitute the given radius into the formula: C = 2 × π × 73
This calculates to approximately: C ≈ 2 × 3.14159 × 73 ≈ 458.04 cm


Convert Centimeters to Meters:

Since 100 cm is equal to 1 m, we convert the circumference to meters by dividing by 100: 458.04 cm = 100 458.04 ​ m = 4.5804 m


Round to One Decimal Place:

The question asks to round the answer to one decimal place: C ≈ 4.6 m



Therefore, the circumference of the circle in meters, rounded to one decimal place, is approximately 4.6 m.

Answered by danjohnbrain | 2025-07-06

The circumference of the circle with a radius of 73 cm is calculated to be approximately 458.04 cm, which converts to 4.58 m. When rounded to one decimal place, the circumference is approximately 4.6 m. Thus, the final answer is 4.6 m.
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Answered by danjohnbrain | 2025-08-08